<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>超时调用</title>
</head>
<body>
    
</body>
<script>
    //超时调用
    var id = setTimeout(function() {alert('五秒之后')},5000)

    //清除定时器
    clearTimeout(id)
</script>
</html>